Lifting jack



Jun 13, 1933- J. J. MIZER ET AL LIFTING JACK Filed Nov. 19, 1930 2 Sheets-Sheet 1 Imfen 011 Jake 01 f 1%? E/rram [JIM/ Maia June 13, 1933. J. J. MIZER ET AL 1,914,149

LIFTING JACK Filed Nov. 19, 1930 2 Sheets-Sheet 2 4; InflenTons 14 4 Tzrraraf 1111 Patented June 13, 1933 UNITED STATES PATENT OFFICE JOSEPH J. MIZER AND EVERRAR-D J. SULLIVAN, L RACINE, WISCONSIN, ASSIGNORS TO WALKER MANUFACTURING COMPANY, OF RACINE, WISCONSIN, A CORPORA- TION OF WISCONSIN Lmrme .mcx

Application filed November 19, 1930. Serial No. 496,896.

This invention relates to certain new and useful improvements in lifting acks, and

particularly to a jack of the screw type adapted for use with automobiles.

In its preferred form, the jack embodies a minimum of moving parts, which moving I "parts are almost completely housed, when the jack is in collapsed position, within a supporting standard formed of pressed metal members or stampings rigidly secured together.

The principal object of this invention is to provide a simple, eflicient and inexpensive jack of the type briefly referred to hereinabove and disclosed more in detail in the specifications which follow.

Another object is to provide an improved sheet metal housing for the moving parts of a lifting jack, said housing being adapted to entirely enclose all of the moving parts except for the outwardly projecting portions of the rotary operating shaft and the vertically moving lifting screw.

Another object is to provide improved means for securing together the component.

. members of the pressed metal housing.

Other objects and advantages of this invention will be more apparent from the fol-' lowing detailed description of certain approved forms of lifting jacks embodying the principles of this invention.

In the accompanying drawings:

Fig. 1 is an elevation of one of the assembled jacks.

Figs. Qpnd 3 are elevations of the two pressed metal standard members, beforethe jack housing is assembled. I

Fig. 4 is a central vertical section through the jack,.the view being taken substantially on the line 4-4 of Fig. 6.

Fig. 5 is a partial vertical section through the lower portion of the jack, the view being taken substantially on the line 5-5 of Fig. 4.

F ig.-.6,is a horizontal section taken substantially. on the line 66 of Fig. 4.

.The movable parts of the jack comprise a vertical lifting screw -1, at the top of which is a-cap-or rest 2 forsupporting the load to 'be lifted. Lifting screw 1 is threaded.

pinion 10 formed at the inner end of shaft 8 meshes with a beveled gear 11 formed on the nut 3. It will now be seen that if the 0. crating shaft 8 is rotated, the nut 3 will 0 rotated about the vertical axis of lifting screw 1, and if the lifting screw is held from rotation (as it will be when engaged with the load), the lifting screw and the load carried thereby will be elevated or lowered, de-

pending upon the direction of rotation of 1 operating shaft,8 and nut 3. Means, adapted for preventingrotation of lifting screw 1 when not in engagement with aload, so that the screw may be initially elevated to an operating position, will be hereinafter described.

The improved sheet metal housing for sup-.

porting and enclosing the movable elements of the jackcomprises, in the embodiment,

here shown, a base plate A, and a pair of similar upright standard sections B and C, the latter being shown in detached perspective in Figs. 2 and 3, respectively.

The base plate A is formed of a single piece of stamped or pressed sheet metal which is strengthened by means of upright side flanges 12 and 13 and ribs or pockets 14 and 15 stamped into the substantially horizontal main portion of the base plate.

Each section B and C of the upright standard is formed to enclose substantially half of an upper disc-like chamber 16 which houses the operating gears and nut and theroller b'earings,.a laterally projecting bearing chamber. 17 in which operating shaft 8 is drical chamber 18 which serves as a housing and upper portions of the standard member .jour'naled, and a vertically extending cyl'inthe forwardly projecting side flange C, except at the outer eno. of the bearing chamber 17 for the operating shaft 8. At the top of the housing section this flange 19 extends as part of vertical cylindrical collar 20 which surrounds the openin through which the lifting screw projects. it the lower end of standard member C, a laterally or horizontally projecting flange 21 is perforated as at 22 to receive rivets 23 or other suitable means by which the standard is attached to and supported from the base plate A. A vertically extending hollow rib 24 extends outwardly from the screw-receiving chamber" 18, and is centered in a plane substantially perpendicular to the plane of side flanges 19. This rib extends from the upper chamber 16 to the lower flange 21 and serves to brace and stiflen the 'ack housing, while at the same time provi ing an internal vertical guide slot 25 for housing the controlling means for the lifting screw, as hereinafter described. The lower end portions 26 of the side flanges 19, and the lower portions 27 of the vertical rib 24 all flare outwardly so as to provide a broader supporting base for the standard and additional increase its stren h.

The other standard section B embodies all of the features just described for the section C, and in addition is provided 'with flanges 28 which project forwardly from the outer edges of the side flanges 19. A semi-circular horizontal ledge or shoulder 29 is formed in each section B and C at the upper end of chamber 18 and lower portion of chamber 16 to provide a firm support for the roller bearin assembly.

Tn the form of jack'here shown a key is formed in or fitted to the lower end of the lifting screw, this key engaging in one or both of the vertical guide grooves 25 to revent rotation of the screw 1 at all times wlthout interfering with its vertical movement. In the form here shown, integral projections 30 are stamped out from each side of the lower threaded end of the screw, these projections 30 extending into and traveling vertically within the guide grooves 25. A transversely extending pin or other form of projection could be mounted .in or on the lifting screw and extend into one or both of the guide grooves 25 for performing the same function, as is well known in this art.

In order to assemble this jack, the screw 1 is threaded into the nut 3, the roller bearing assembly is positioned on the lower portion of the screw beneath the nut, and these assembled members are laid in sition within the housing member B. he operating shaft 8 with pinion 10 thereon'are put in place within the housin extension 17 of member B. The other hal C of the housing is then positioned against the member B, within 5 28 thereof, with all of the edge flanges 19 of the two members in face contact with one anrename other. 4 Preferably the vertically engaged pairs of side flanges 19 are spot welded together at points substantially mid-way of the height of the jack, as indicated at 31. The edge flanges 28 of member B are then folded over and clamped against the outer sides of side flanges 19 of the member 0 so as to bind the two housing sections firmly together, as indicated in Fig. 1. While the overlapped edge flanges "28 are. suflicient to hold the standard members together, it is desirable to use spot welds or rivets, such as indicated at 31, to prevent relative shifting of the overlapped edge flanges and consequently weaving of the standard elements. It has been found that a single spot weld between each pair of the vertical overlapping flanges will give the desired rigidity to the standard, although more of such welds or positive connections could be used if found to be desirable. The bottom flanges 21 of the two housing sections B and C are then secured to the base plate A by rivets 23 or some equivalent fasteners. Before the housing is entirely assembled, it may be packed with grease so as to assist the operation of the moving parts and keep them in proper condition. The completed jack will be painted or enameled, thus sealing all of the joints, and the only openings remaining in the casing are the upper passage 20, through which the lifting screw reciprocates, and the lateral passage 17 in which the operating shaft ,8 is journaled. Thus there will be very little escape of grease and the operating parts will be protected against oxidation and maintained in proper smooth working condition for an indefinite period of time.

We claim:

1. A housing and supporting means for the movable parts of a lifting jack, comprising a pair of similar pressed metal standard sections and a base plate, the standard sections being formed to provide an upright tubular guide passage for a lifting element, there being laterally extending flanges on the lower ends of the standard sections for attachment to the base plate, the base plate closing the lower end of the passage, the upper end of the passage at the. upper end of the standard being open so that a lifting member may be projected upwardly therethrough, the standard and passage being expanded at a location below the upper end of the passage to form a closed gear casing, the standard also being formed at one side to provide a bearing for-an operating shaft extending laterally from the gear casing, the standard sections beingeach formed to provide substantially one-half of the main guide passage, the upper opening, the gear casing and the laterally extending bearing, the

standard sections being formed with matin flanges along the side and top edges thereo and means for securing the flanges together.

2. A housing and sup orting means for the movable parts of a llf ting jack, comprising a pair of similar pressed metal standard sections and a base plate, the standard sections being formed to provide an upright tubular guide passage for a lifting element, there being laterally extending flanges on the lower ends of the standard sections for attachment to the base plate, the base plate closing the lower end of the passage, the upper end of the passage at the upper end of the standard being open so that a lifting member may be projected upwardly therethrough, the standard and passage being expanded at a location below the upper end 0 the passage to form a closed gear casing, the standard also being formed at one side to provide a bearing for an operating shaft extending laterally from the gear casing, the standard sections bein each formed to provide substantially onealf of the main guide passage, the upper opening, the gear casing and the laterally extending bearing, the standard sections being formed with matin flanges along the side and top edges thereo the tubular wall enclosin the upper opening being formed by contlnuations of these flanges, and means for securing the flanges together.

3. A housing and supportin means for the movable parts of a lifting jac ,com rising a pair of similar pressed metal/ stan ard sections and a base plate, the standard sections being formed to provide an upright tubular guide passage for a lifting element, means or securing the base plate to the lower ends of the standard sections, the base plate closing the lower end of the passage, the u per end of the passage at the upper end 0 the standard bemg open so that a lifting member may be projected upwardly therethrough, the standard and passage being expanded at a location below the upper'end of the passage to form a closed gear casing, the standard also being formed at one side to provide a bearing for an operating shaft extending laterally from the gear casing, the standard sections bein each formed to rovide substantially onealf of the main guide passage, the upper opening, the gear casing and the laterally extending bearing, the standard sections being formed with matin flanges along the side and top edges thereo and means for securing the flan es together.

4. A ousing and supportin means for the movable parts of a lifting j acl com rising a pair of similar pressed metal stan ard sections and a base plate, the standard sections being formed to provide an upright tubular guide passage for a lifting element, there being laterally extending flanges on the lower ends of the standard sections for attachment tothe base plate, the. base plate closing the lower end of the passage, the upper end of thepassage at the upper end of t e standard the gear casing, the standar sections being each formed to provide substantially onehalf of the main guide passage opening, the gear casing and the laterally extending bearing, the standard sections being formed with matin flanfges along the side and top edges thereo the anges on one f of the members bein of greater width than the flanges on the ot er member and folded over the last mentioned flanges to bind the members to ether.

5. In com ination with the movable parts of a lifting jack including a vertically movable lifting screw, a nut through which the screw is threaded, bearings for supporting the nut, a laterally projecting rotatable operating shaft, and gearing connecting the shaft and nut, a housing and supporting means comprismg a pair of similar pressed metal standard sections and a-base plate, the standard sections bein formed to provide an upright tubular gui e passage 'for the lifting screw, means for securing the base plate to the lower ends of the standard sections, the base plate closing the lower ends of the passage, the upper end of the passage at the upper end of the standard being open so that the lifting screw may be projected upwardly therethrough, the standard and passage being expanded at a location below the upper end of the passage to form a gear casing for the upper housing the nut, gearing and bearings, the

standard also being formed at one side to provide a. bearing for the operating shaft extending laterally from the gear casing, the standard sections bein each formed to provide substantially onealf of the main guide passage, the upper opening, the gear casing, and the laterally extending bearing, the standard sections bein formed with -mating flanges along the si e and top edges thereof, and

means for securing these flanges together.

6. In combination with the movable parts of a lifting jack including a vertically movable lifting screw, a nut through which the screw is threaded, bearings for supporting the nut, a laterally projecting rotatable operating shaft,and gearing connecting the shaft and nut, a housing and supporting means comprising a pair of similar pressed metal stan ard sections and a base plate, the standard sections being formed to provlde an upright tubular guide passage for the lifting screw, means for securing the base plate to the lower ends of the standard sections, the base plate closing the lower ends of the passage, the upper end of the passage at the upper end of the standard being open 4 neraiee so that the lifting screw may be projected upwardl therethrough, the standard and passage being expanded at a location below the upper end of the passage to form a gear casing for housing the nut, gearing and bearings, the standard also being formed at one side to provide a bearing for the operating shaft extending laterally from the gear casing, the standard sections being each formed to provide substantially one-half of the main guide passage, the upper opening, the gear casing, and the laterally extending bearing, the standard sections being formed with mating flanges along the side and top edges thereof, the tubular wall enclosing the upper openin being formed by continuations of these anges, and means for securing these flanges together.

7. In combination with the movable parts of a lifting jack including a vertically movable lifting screw, a nut through which the screw is threaded, bearings for supplorting the nut, a laterally projecting rotata le operating shaft, and gearing connecting the shaft and nut, a housing and supporting means comprising a pair of similar pressed metal standard sections and a base plate, the standard sections being formed to provide an upright tubular guide passage for the lifting screw, means for securing the base plate to the lower ends of the standard sections, the base plate closing the lower end of the passage, the upper end of the passage at the upper end of the standard being open so that the lifting screw may be rojected upwardly therethrough, the stan aid and passage bein expanded at a location below the upper engof the passage to form a gear casing for housing the nut, gearing and bearings, the standard also being formed at one side to provide a bearing for the operating shaft extending laterally from the gear casing, the standard sections being each formed to provide substantially one-half of the main guide passage, the upper opening, the gear casing, and the laterall extending bearing, the standardgections being formed with mating flan es along the side and top edges thereof, the anges on one of these sections being of greater width than the flanges on the other section and folded over the last mentioned flanges to bind the sections together.

JOSEPH J. MllZER. EVERRARD J. SULLIVAN. 

